June 2013 we had a garden that was full of 1m high weeds, the garden measured 16m x 10m. I purchase "Bayer Super Strength Glyphosate" and over 8 weeks gave the garden 2 sprays which killed off all of the weeds.

I then turned the soil in the garden and built it up by 3" using externally brought soil. I then laid Rolawn Medallion turf rolls.

Everything was fine until early Spring 2014 when a patch of the weeds (see pics attached) appeared in one area in the centre of the lawn. I brought some Roundup Gel and began applying it, after 6 weeks & 4 applications the weeds died off. However the Roundup Gel also killed patches of my lawn.

Within days of the weeds dying off, and we thought that was the end of it, we started to see more appearing all over the lawn. Now we have hundreds appearing, there everywhere. They're growing faster than the grass is, I left one grow on the outside of my lawn and the leaf grew to 12" before I dug it up.

I tried to dig one up by the roots, however it is so deep, they appear to becoming from the original ground level - below the 3" of soil I put down before laying the turf.

I'm really lost and not sure where to turn. Our lovely green lawn is turning into a bed of weeds.

Mike - thank you for taking the time to provide your advice. One question If the only way the weed can multiply is by flowering and seeding, is it possible to stop them multiplying by mowing so that they never get to that stage? then I only need to worry about the weeds that are currently there, in which case assume they are perennial weeds, are perennials for ever or do they loose strength over a number of years?

It is a broadleaf weed,but they are still small. Thing is you dont want to go cutting your grass short while we have this dry spell.

We use Westland Lawn feed, weed and moss killer, its taken every dandelion, daisy, plantain etc out, lovely lawn, , they may come back later in the year, use it again, then catch them again next April.

Once again, look at the reviews on Amazon.

You need to be careful when you apply it, if it gets on your flower borders, it will damage your plants.

All is not lost, just keep at it. The colour of the lawn is fantastic, almost sea green/blue, the more you can strengthen your lawn, the better it will be.

I have used others but find Westland the best.

just to add...I am no way connected with the Westland company, just swear by their products.

Lyn/mike - I really appreciate both of you taking the time to give your advice. I'm going to start with the weed killers that can be used on lawns and then move onto the more significant approach of digging them up at the roots if it doesn't work.

Looks like what you have growing is a plant called Anchusa, and it has notoriously long tap roots. A selective weedkiller suitable for lawns will soon see it off though, plus the process of mowing will weaken it too.

Early days Tony. I know it's disappointing when you've done all the prep and you feel you should have a green sward with no trace of weeds anywhere, but grass is an ongoing job. Lyn's right - a weed and feed will get rid of most of the weeds but you'll always get some seeding in from elsewhere so you just have to keep up the maintenance. If it's any comfort - I moved into this house just over a year ago. The front grass was mainly weeds. It had a feed which encouraged the grass, followed by a weed and feed, and the grass was in good heart after that. It's had another application this spring and will get a liquid seaweed feed soon just to give it a boost as it's been very dry. There are very few weeds in it now, and while it isn't a bowling green, it's nice and green and healthy.

I was actually thinking of growing this, just last week until i realised that it was every where. It has a outstanding orange colour but does not last long (about 2 weeks) before it goes to seed and it is doing that right now up here. This is the first year that i have really noticed it. Strange how they creep up and then take over.